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Circuits designed by David Johnson, P.E.

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Last Updated on:  06/21/2009 05:58:42 AM

Battery Monitor Circuits

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9v Battery Voltage Monitor using a LTC1440 Comparator
This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts.  It uses a LTC1440 comparator, which also contains a 1.18v reference diode.  In standby mode, the circuit draws only 4uA.

Circuit 9V Battery Voltage Monitor Circuit using a LTC1440 comparator designed by David Johnson, P.E. (June 30, 2006)

Battery Monitor Circuits
Master Schematic Category List - David A. Johnson, P.E.
 
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